CN220122790U - Constant-current discharge circuit of bus capacitor of motor controller - Google Patents
Constant-current discharge circuit of bus capacitor of motor controller Download PDFInfo
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- CN220122790U CN220122790U CN202321685608.3U CN202321685608U CN220122790U CN 220122790 U CN220122790 U CN 220122790U CN 202321685608 U CN202321685608 U CN 202321685608U CN 220122790 U CN220122790 U CN 220122790U
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Abstract
The utility model provides a constant current discharge circuit of a bus capacitor of a motor controller, wherein: the first end of the constant current discharge unit is respectively connected with the positive electrode of the high-voltage power supply and one end of the bus capacitor; the negative electrode of the high-voltage power supply, the other end of the bus capacitor, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer are connected with a high-voltage ground; the control end of the constant current discharge unit is connected with the first end of the isolation unit; the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer; the second end of the isolation unit is connected with the first end of the MCU; the first end of the power chip is connected with the second end of the MCU; the second end of the power chip is connected with the first end of the secondary side of the isolation transformer; the third end of the power chip is connected with the positive electrode of the power supply; the fourth end of the power chip, the second end of the secondary side of the isolation transformer and the negative electrode of the low-voltage power supply are all connected with low-voltage ground; namely, the constant current discharge mode is adopted to discharge the bus capacitor, so that the discharge time of the bus capacitor is shortened.
Description
Technical Field
The utility model belongs to the technical field of main drive motor controllers, and particularly relates to a constant current discharge circuit of a bus capacitor of a motor controller.
Background
A bus capacitor with a larger capacitance and voltage resistance is arranged on the high-voltage side of the motor controller, and the whole motor controller provides high voltage power for the controller. The bus capacitor is fully charged by the high-voltage power, but after the high-voltage power is turned off, the charge on the bus capacitor is not consumed, and potential safety hazards exist, so a discharging circuit of the bus capacitor needs to be designed.
At present, a water pump motor controller within 10KW discharges a bus capacitor in a mode of directly using parallel resistors.
However, the parallel resistor type discharge speed is low, and meanwhile, the parallel resistor type discharge speed is only suitable for the water pump motor sensor without the position sensor, and the main drive motor controller is provided with a rotary position sensor, so that the same ground with high voltage cannot be achieved, therefore, the MCU of the main drive motor controller needs to adopt an isolation type to perform capacitor discharge, namely the prior scheme cannot be suitable for the main drive motor controller.
Disclosure of Invention
Therefore, the utility model aims to provide a constant current discharge circuit of a bus capacitor of a motor controller, which is used for discharging the bus capacitor in a constant current discharge mode, so as to shorten the discharge time of the bus capacitor; meanwhile, the low-voltage side is different from the high-voltage side, and the MCU of the main drive motor controller needs to adopt an isolation mode to carry out capacitor discharge, so that the method is suitable for the main drive motor controller.
The utility model discloses a constant current discharge circuit of a bus capacitor of a motor controller, which comprises: the device comprises a high-voltage power supply, a low-voltage power supply, a bus capacitor, a constant-current discharge unit, an isolation unit, an MCU, a power chip and an isolation transformer;
the first end of the constant current discharge unit is respectively connected with the positive electrode of the high-voltage power supply and one end of the bus capacitor;
the negative electrode of the high-voltage power supply, the other end of the bus capacitor, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer are connected with a high-voltage ground;
the control end of the constant current discharge unit is connected with the first end of the isolation unit;
the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer;
the second end of the isolation unit is connected with the first end of the MCU;
the first end of the power chip is connected with the second end of the MCU;
the second end of the power chip is connected with the first end of the secondary side of the isolation transformer;
the third end of the power supply chip is connected with the positive electrode of the low-voltage power supply;
the fourth end of the power chip, the second end of the secondary side of the isolation transformer and the negative electrode of the low-voltage power supply are all connected with low-voltage ground.
Optionally, in the constant current discharge circuit of the bus capacitor of the motor controller, the constant current discharge circuit further includes: a power supply unit;
the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer through the power supply unit;
the fourth terminal of the isolation unit is connected to the low voltage ground.
Optionally, the power supply unit is an isolated power supply chip.
Optionally, the isolated power supply chip is a DC/DC chip or an LDO chip.
Optionally, in the constant current discharge circuit of the bus capacitor of the motor controller, the isolation unit includes: isolating the optocoupler.
Optionally, in the constant current discharge circuit of the bus capacitor of the motor controller, an anode of the light emitting diode in the isolation optocoupler is used as the second end of the isolation unit;
the cathode of the light emitting diode in the isolation optocoupler is used as the fourth end of the isolation unit;
the input end of the triode in the isolation optocoupler is used as the first end of the isolation unit;
and the output end of the triode in the isolation optocoupler is used as a third end of the isolation unit.
Optionally, in the constant current discharge circuit of the bus capacitor of the motor controller, the isolating optocoupler adopts TLX9291A.
Optionally, in the constant current discharge circuit of the bus capacitor of the motor controller, the constant current discharge unit includes: the current limiting unit, the first bias resistor, the second bias resistor, the first switch and the second switch;
a first end of the first switch is used as a first end of the constant current discharge unit;
the control end of the first switch is respectively connected with the first end of the second switch, one end of the first bias resistor and one end of the second bias resistor;
the other end of the first bias resistor is used as a control end of the constant current discharge unit;
one end of the current limiting unit is connected with the second end of the first switch and the control end of the second switch respectively;
the other end of the current limiting unit and the other end of the second bias resistor are both connected with high-voltage ground;
the second end of the second switch is used as the second end of the constant current discharge unit.
Optionally, in the constant current discharging circuit of the bus capacitor of the motor controller, the current limiting unit includes: a current limiting resistor;
the current limiting resistor is arranged between a high-voltage ground and a connection point between the second end of the first switch and the control end of the second switch.
Optionally, the low-voltage power supply is a 12V power supply.
According to the technical scheme, the constant current discharging circuit of the bus capacitor of the motor controller provided by the utility model comprises the following components: the first end of the constant current discharge unit is respectively connected with the positive electrode of the high-voltage power supply and one end of the bus capacitor; the negative electrode of the high-voltage power supply, the other end of the bus capacitor, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer are connected with a high-voltage ground; the control end of the constant current discharge unit is connected with the first end of the isolation unit; the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer; the second end of the isolation unit is connected with the first end of the MCU; the first end of the power chip is connected with the second end of the MCU; the second end of the power chip is connected with the first end of the secondary side of the isolation transformer; the third end of the power chip is connected with the positive electrode of the power supply; the fourth end of the power chip, the second end of the secondary side of the isolation transformer and the negative electrode of the low-voltage power supply are all connected with low-voltage ground; namely, a constant current discharging mode is adopted to discharge the bus capacitor, so that the discharging time of the bus capacitor is shortened; meanwhile, the low-voltage side is different from the high-voltage side, and the MCU of the main drive motor controller needs to adopt an isolation mode to carry out capacitor discharge, so that the method is suitable for the main drive motor controller.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a constant current discharge circuit of a bus capacitor of a motor controller according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of a constant current discharge circuit of a bus capacitor of another motor controller according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the utility model provides a constant current discharge circuit of a bus capacitor of a motor controller, which is used for solving the problems that in the prior art, the speed of discharging by adopting a parallel resistor mode is low, and meanwhile, as the motor controller is only suitable for a water pump motor sensor without a position sensor, and a main drive motor controller is provided with a rotation position sensor, the rotation position sensor cannot be the same as high voltage, the MCU of the main drive motor controller needs to adopt an isolation mode to perform capacitor discharging, namely the prior scheme cannot be suitable for the main drive motor controller.
Referring to fig. 1, the constant current discharge circuit of the motor controller bus capacitor C1 includes: the high-voltage power supply HV, the low-voltage power supply LV, the bus capacitor C1, the constant-current discharge unit, the isolation unit, the MCU, the power chip and the isolation transformer T.
The first end of the constant current discharge unit is respectively connected with the positive electrode of the high-voltage power supply HV and one end of the bus capacitor C1.
That is, the high-voltage power source HV may charge the bus capacitor C1, and after the high-voltage power source HV is powered down, the bus capacitor C1 may be discharged through the constant-current discharge unit.
In addition, the constant current discharge unit adopts a constant current discharge mode, so that the discharge time of the bus capacitor C1 can be shortened.
The end of the bus capacitor C1 connected to the high voltage power supply HV serves as the positive electrode of the bus capacitor C1.
The negative electrode of the high-voltage power supply HV, the other end of the bus capacitor C1, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer T are connected with the high-voltage ground HVGND.
The bus capacitor C1 may employ a capacitance of 680uF, 400V.
The control end of the constant current discharge unit is connected with the first end of the isolation unit.
The third end of the isolation unit is connected with the second end of the primary side of the isolation transformer T.
Specifically, the isolation unit receives the power supply of the low-voltage power supply LV through the isolation transformer T, that is, the low-voltage power supply LV is transformed by the isolation transformer T and then supplies the power to the isolation unit.
The second end of the isolation unit is connected with the first end of the MCU.
That is, the control end of the constant current discharge unit is connected to the first end of the MCU through the isolation unit.
Therefore, the MCU adopts isolation driving for the control of the constant current discharge unit.
The first end of the power chip is connected with the second end of the MCU.
That is, the MCU receives power of the low voltage power supply LV through the power chip.
Specifically, the low-voltage power supply LV supplies power to the MCU after being processed by the power chip.
The second end of the power chip is connected with the first end of the secondary side of the isolation transformer T.
The third terminal of the power chip is connected to the positive pole of the low voltage power supply LV.
The fourth end of the power chip, the second end of the secondary side of the isolation transformer T and the negative electrode of the low-voltage power supply LV are all connected with the low-voltage ground GND.
It should be noted that all devices on the high-voltage side of the isolation transformer T are connected to the high-voltage ground HVGND; all devices on the low voltage side of the isolation transformer T are connected to the low voltage ground GND; that is, the high pressure side is realized differently from the low pressure side.
The high voltage side and the low voltage side may be divided by isolating both sides of the transformer T.
Further, the MCU adopts an isolated driving for the control of the constant current discharge unit to satisfy the purpose of isolation and control between the high voltage side and the low voltage side.
In the embodiment, a first end of a constant current discharge unit is respectively connected with an anode of a high-voltage power supply HV and one end of a bus capacitor C1; the negative electrode of the high-voltage power supply HV, the other end of the bus capacitor C1, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer T are connected with the high-voltage ground HVGND; the control end of the constant current discharge unit is connected with the first end of the isolation unit; the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer T; the second end of the isolation unit is connected with the first end of the MCU; the first end of the power chip is connected with the second end of the MCU; the second end of the power chip is connected with the first end of the secondary side of the isolation transformer T; the third end of the power chip is connected with the positive electrode of the low-voltage power supply LV; the fourth end of the power chip, the second end of the secondary side of the isolation transformer T and the negative electrode of the low-voltage power supply LV are all connected with the low-voltage ground GND; namely, a constant current discharging mode is adopted to discharge the bus capacitor C1, so that the discharging time of the bus capacitor C1 is shortened; meanwhile, the low-voltage side is different from the high-voltage side, and the MCU of the main drive motor controller needs to adopt an isolation mode to carry out capacitor discharge, so that the method is suitable for the main drive motor controller.
In addition, the low voltage power supply LV may be a 12V power supply.
Of course, other power sources are not excluded, and are not described in detail herein, and are all within the scope of the present utility model.
It should be noted that, the constant current discharge circuits of the bus capacitors all belong to the components of the motor controller, and of course, the motor controller also includes other components, such as a rotational position sensor and the like. Since the interface such as the rotational position sensor in the motor controller can only be on the low voltage side of the 12V battery, and the MCU needs to be the same as the interface such as the rotational position sensor, the MCU is the same as the 12V battery.
The power chip is responsible for supplying power to the MCU, and simultaneously drives the isolation transformer T to supply power to the constant current discharge unit. The isolation optocoupler U1 is used for isolating the control signal of the MCU and then controlling the constant current discharge. That is, the constant current discharge circuit is a function to replace the switch and resistor in the prior art.
The main benefit of constant current discharge is that it is faster than prior art discharge. Assuming again 400V680uF, the discharge is performed at a maximum of 100 mA.
The prior art is based on the maximum 100mA parallel resistor of 400V/100 ma=4kΩ, and the time required to discharge the charge on the capacitor is 5×680uf×4kΩ=13.6s.
And the constant current discharge cell discharge time is 400v x 680 uf/0.1a=2.72S.
Therefore, compared with the prior art, the discharge speed of the utility model is greatly improved.
In practical application, referring to fig. 2, the constant current discharge circuit of the bus capacitor of the motor controller further includes: and a power supply unit.
The third end of the isolation unit is connected with the second end of the primary side of the isolation transformer T through the power supply unit.
The fourth terminal of the isolation unit is connected to the low voltage ground GND.
Specifically, the power supply unit may be an isolated power supply chip, where the isolated power supply chip may be a DC/DC chip or an LDO chip, which are not described in detail herein, and may be provided according to practical situations, which are all within the protection scope of the present utility model.
In practical application, referring to fig. 3, the isolation unit includes: isolating the optocoupler.
Specifically, the isolated optocoupler may employ TLX9291A. Of course, other types of isolation optocouplers may be adopted, which are not described in detail herein, and may be used according to actual situations, which are all within the protection scope of the present utility model.
The two sides of the isolation unit are isolated, that is, the MCU is isolated from the constant current discharge circuit, and the MCU can perform isolation control on the constant current discharge circuit. Wherein the first end and the third end of the isolation unit belong to one side, and the second end and the fourth end of the isolation unit belong to the other side; i.e. the side of the first and third ends is isolated from the side of the second and fourth ends.
In practical application, referring to fig. 4, the anode of the light emitting diode in the isolation optocoupler U1 is used as the second end of the isolation unit.
Specifically, the anode of the light emitting diode in the isolation optocoupler U1 is connected to the first end of the MCU as the second end of the isolation unit.
The first end of the MCU may be a GPIO port, which is not described in detail herein, and may be determined according to practical situations, which are all within the protection scope of the present utility model.
The cathode of the light emitting diode in the isolated optocoupler U1 serves as the fourth terminal of the isolation unit.
Specifically, the cathode of the light emitting diode in the isolated optocoupler U1 is used as the fourth end of the isolation unit and is connected to the low voltage ground GND.
The input end of the triode in the isolation optocoupler U1 is used as the first end of the isolation unit.
Specifically, the input end of the triode in the isolation optocoupler U1 is used as a first end of the isolation unit and is connected with the second end of the primary side of the isolation transformer T.
The output end of the triode in the isolation optocoupler U1 is used as a third end of the isolation unit.
Specifically, the output end of the triode in the isolation optocoupler U1 is used as the third end of the isolation unit to be connected with the third end of the constant current discharge unit.
The input end of the triode is the base electrode of the triode; the output end of the triode is the collector electrode of the triode.
The working principle of the isolation optocoupler U1 will now be described:
when the anode of the light emitting diode in the isolation optocoupler U1 receives a signal of a GPIO port of the MCU, such as GPIO=1, the light emitting diode is in a light emitting state, the triode in the isolation optocoupler U1 is influenced by the light emitting diode, the triode in the isolation optocoupler U1 is conducted, and a power supply at the input end of the triode is connected to the control end of the constant current discharge unit; the constant current discharge unit starts constant current discharge.
When the anode of the light emitting diode in the isolation optocoupler U1 does not receive a signal of a GPIO port of the MCU, such as GPIO=0, the light emitting diode is in an off state, the triode in the isolation optocoupler U1 is influenced by the light emitting diode, the triode in the isolation optocoupler U1 is turned off, the input end and the output end of the triode are disconnected, and the control end of the constant current discharge unit does not receive a corresponding signal; the constant current discharge unit stops discharging.
In practical application, referring to fig. 5, the constant current discharge unit includes: the current limiting unit, a first bias resistor R2, a second bias resistor R3, a first switch Q1 and a second switch Q2.
The first terminal of the first switch Q1 serves as a first terminal of the constant current discharge unit.
Specifically, the first end of the first switch Q1 is used as a first end of the constant current discharge unit, and is connected to the positive electrode of the high voltage power source HV and one end of the bus capacitor C1 respectively.
The control end of the first switch Q1 is connected to the first end of the second switch Q2, one end of the first bias resistor R2, and one end of the second bias resistor R3, respectively.
The other end of the first bias resistor R2 serves as a control end of the constant current discharge unit.
Specifically, the other end of the first bias resistor R2 is used as a control end of the constant current discharge unit and is connected with the third end of the isolation unit.
More specifically, the other end of the first bias resistor R2 is used as a control end of the constant current discharge unit and is connected with an output end of the triode in the isolation optocoupler U1.
One end of the current limiting unit is connected with the second end of the first switch Q1 and the control end of the second switch Q2 respectively.
The other end of the current limiting unit and the other end of the second bias resistor R3 are both connected with the high-voltage ground HVGND.
The second terminal of the second switch Q2 serves as the second terminal of the constant current discharge unit.
Specifically, the second terminal of the second switch Q2 is used as the second terminal of the constant current discharge unit, and is connected to the high voltage ground HVGND.
In practical application, referring to fig. 6, the current limiting unit includes: and a current limiting resistor R1.
The current limiting resistor R1 is disposed between the high voltage ground HVGND and a connection point between the second end of the first switch Q1 and the control end of the second switch Q2.
Specifically, one end of the current limiting resistor R1 is connected with the second end of the first switch Q1 and the control end of the second switch Q2 respectively; the other end of the current limiting resistor R1 is connected with the high-voltage ground HVGND.
The other end of the current limiting unit, the other end of the second bias resistor R3, and the second end of the common second switch Q2 may be connected to the high-voltage ground HVGND as the second end of the constant-current discharging unit.
Referring to fig. 7, which shows a schematic diagram of an isolation unit and a constant current discharge unit, the functions of the respective devices in the constant current discharge circuit are described below:
the second bias resistor R3 is to provide Vgs bias voltage to the NMOS.
The first bias resistor R2 is to better regulate the Vgs bias voltage of the NMOS.
The current limiting resistor R1 is used for setting a current value of constant current discharge, and is specifically explained by combining the second switch Q2:
the second switch Q2 is to implement a constant current limit, and when the current ids_q1, ids_q1×r1> vbe_q2 flowing through the current limiting resistor R1, the second switch Q2 is turned on, and the first switch Q1 is controlled to a constant current region.
The first switch Q1 is an NMOS, and the device is a constant current discharge main power device.
It should be noted that, the left side of the optocoupler is the high-voltage ground HVGND, the right side of the optocoupler is the low-voltage ground GND, and the MCU is also controlled on the low-voltage side. The VDD5v_wl is the isolated power supply after the isolation voltage transformation of the 12V battery input. Other devices are designed to achieve constant current driving.
The following describes the process of controlling the constant current discharge unit by the MCU:
(1) When no signal is output from the first end of the MCU, the isolation unit is turned off to output, and the first switch Q1 and the second switch Q2 are both in a turned-off state to stop discharging the bus capacitor C1.
Specifically, as shown in fig. 7, when the MCU gpio=0, the output of the isolation optocoupler U1 is turned off, and at this time, the voltage division on the second bias resistor R3 is 0V, and the first switch Q1 is in the off state, so that the high-voltage bus capacitor C1 is not discharged. The current of the current limiting unit, i.e. the current ids_q1=0a of the first switch Q1, so the second switch Q2 is also in the off state.
(2) When a signal is output from the first end of the MCU, the isolation unit is started to output, the first switch Q1 is in an on state, and the bus capacitor C1 starts to be discharged.
Specifically, as shown in fig. 7, when MCU gpio=1, the output of the isolation optocoupler U1 is turned on, and at this time, the voltage of the second bias resistor R3 and the voltage of the first bias resistor R2 are divided, so that the first switch Q1 enters an on state, and at this time, the high-voltage bus capacitor C1 starts to be discharged.
(3) When the voltage of the current limiting unit is greater than the conducting voltage of the second switch Q2, the second switch Q2 is in an on state, and the first switch Q1 is controlled to a constant current region.
Specifically, after the bus capacitor C1 starts to be discharged, the current of the current limiting unit, that is, the current ids_q1 of the first switch Q1 gradually increases. When the current ids_q1 flowing through the current limiting unit meets ds_q1×r1> vbe_q2, the second switch Q2 is turned on, and the first switch Q1 is controlled to the constant current region, so that the constant current discharging function is completed.
Wherein vbe_q2 is the on threshold voltage of the second switch Q2.
As shown in fig. 7, the specific discharge path is hv+ to the first switch Q1 to the current limiting resistor R1 back to HV-; wherein HV+ is a high voltage positive electrode, HV-is a high voltage negative electrode, namely high voltage ground HVGND.
In the embodiment, the current parameter of constant current discharge is flexibly matched through the resistance value of the current limiting resistor R1, and the threshold value is Vbe_Q2 divided by the current value required by the constant current discharge, so that the purpose of simply matching the constant current discharge is achieved; and the time of the whole discharge after the constant current discharge is used is greatly shortened.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present utility model.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A constant current discharge circuit of a bus capacitor of a motor controller, comprising: the device comprises a high-voltage power supply, a low-voltage power supply, a bus capacitor, a constant-current discharge unit, an isolation unit, an MCU, a power chip and an isolation transformer;
the first end of the constant current discharge unit is respectively connected with the positive electrode of the high-voltage power supply and one end of the bus capacitor;
the negative electrode of the high-voltage power supply, the other end of the bus capacitor, the second end of the constant-current discharge unit and the first end of the primary side of the isolation transformer are connected with a high-voltage ground;
the control end of the constant current discharge unit is connected with the first end of the isolation unit;
the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer;
the second end of the isolation unit is connected with the first end of the MCU;
the first end of the power chip is connected with the second end of the MCU;
the second end of the power chip is connected with the first end of the secondary side of the isolation transformer;
the third end of the power supply chip is connected with the positive electrode of the low-voltage power supply;
the fourth end of the power chip, the second end of the secondary side of the isolation transformer and the negative electrode of the low-voltage power supply are all connected with low-voltage ground.
2. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 1, further comprising: a power supply unit;
the third end of the isolation unit is connected with the second end of the primary side of the isolation transformer through the power supply unit;
the fourth terminal of the isolation unit is connected to the low voltage ground.
3. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 2, wherein the power supply unit is an isolated power supply chip.
4. A constant current discharge circuit of a bus capacitor of a motor controller according to claim 3, wherein the isolated power supply chip is a DC/DC chip or an LDO chip.
5. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 1, wherein the isolation unit comprises: isolating the optocoupler.
6. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 5, wherein an anode of a light emitting diode in the isolation optocoupler is used as a second end of the isolation unit;
the cathode of the light emitting diode in the isolation optocoupler is used as the fourth end of the isolation unit;
the input end of the triode in the isolation optocoupler is used as the first end of the isolation unit;
and the output end of the triode in the isolation optocoupler is used as a third end of the isolation unit.
7. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 5, wherein the isolating optocoupler is TLX9291A.
8. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 1, wherein the constant current discharge unit comprises: the current limiting unit, the first bias resistor, the second bias resistor, the first switch and the second switch;
a first end of the first switch is used as a first end of the constant current discharge unit;
the control end of the first switch is respectively connected with the first end of the second switch, one end of the first bias resistor and one end of the second bias resistor;
the other end of the first bias resistor is used as a control end of the constant current discharge unit;
one end of the current limiting unit is connected with the second end of the first switch and the control end of the second switch respectively;
the other end of the current limiting unit and the other end of the second bias resistor are both connected with high-voltage ground;
the second end of the second switch is used as the second end of the constant current discharge unit.
9. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 8, wherein the current limiting unit comprises: a current limiting resistor;
the current limiting resistor is arranged between a high-voltage ground and a connection point between the second end of the first switch and the control end of the second switch.
10. The constant current discharge circuit of a bus capacitor of a motor controller according to claim 1, wherein the low voltage power supply is a 12V power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685608.3U CN220122790U (en) | 2023-06-29 | 2023-06-29 | Constant-current discharge circuit of bus capacitor of motor controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321685608.3U CN220122790U (en) | 2023-06-29 | 2023-06-29 | Constant-current discharge circuit of bus capacitor of motor controller |
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